perf auxtrace: Uninline functions that touch perf_session

So that we don't carry the session.h include directive in auxtrace.h,
which in turn opens a can of worms of files that were getting all sorts
of things via that include, fix them all.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-d2d83aovpgri2z75wlitquni@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/event_update.c

@@ -1,8 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/compiler.h>
 #include <perf/cpumap.h>
+#include <string.h>
 #include "evlist.h"
 #include "evsel.h"
+#include "header.h"
 #include "machine.h"
 #include "tool.h"
 #include "tests.h"